MeanSquaredError

@margaretselzer > I would suggest to drop the 11 from sqlpp11and just call it **sqlpp**. Add `optional`, `string_view` and `span` to the next release of the lib and just require...

> Well, I'm obviously oblivious to the history. Thanks for the background. Aliasing these constructs is then a good way to solve the compatibility issue. Is that all that's missing...

@FunMiles Actually another nice improvement in C++20 is that it supports `std::local_time` and `std::zoned_time` which allows one to express more clearly the time zone of the written/read timestamps.

@yiz6688 `std::function` does not need to convert to a C-style function. The purpose of the thunking library is to perform that conversion.

Having the modern target `rapidjson::rapidjson` is quite handy. Is there a reason why it hasn't been merged yet into the master branch?

Trying to parse YAML to a map with string keys and structure values fails too. ``` struct config_struct { struct mystruct { bool myval; }; std::unordered_map myval2; }; ``` The...

> currently supported map of arbitrary parameters (FIGCONE_DICT) Do you mean that currently FIGCONE_DICT supports maps where the value is a structure? Or does it require the value to always...

> If "server_N" and "server_N_param_N" are arbitrary, and you cannot register a structure with expected field names, then no, there's no better way than using some combination of a node...

@Arthapz Thanks for the update. Just a few questions regarding the support for header units: 1. You provided a link to the clang-scan-deps issue where we can monitor the current...

> Side question: Why does the mock context have features that the real contexts do not? I am not familiar with all the gory details of the contexts, but most...